Pump



C. S. McINTYRE.

PUMP.

APPLICATION FILED FEB. 10, 1920.

"1,335,251. v Patented Mar. 30,1920.

cnmns s. Moms-urns, or monnon, nrrcnreniv.v

PUMP.

Specification of Letters Patent. Patented Mar, 30, 1920,

Application filed February 10,- 1920. Serial No. 357,564.

To all whom it may conbern:

Be it known that I,--CHARLEs S. MCIN- :TYRE, a citizen of the UnitedStates, resid 'ing at Monroe, in the county of Monroe and State of Michian, have invented certain new and useful mprovements in Pumps, of whichthe following is a specification.

This invention relates to pumps, and more particularly to hand air andgas pumps, and it comprises a pump having a cylinder, a piston, a pistonrod and handle therefor, lubricating means for the piston advantageouslyconsisting of a compressible lubricant absorbing material, means formaintaining said material in proximity to the piston, and means,advantageously surrounding the piston rod, arranged for compressing saidabsorbent'material at the end of the stroke of the piston, preferablythe suction stroke, whereby lubricant carried by said absorbent materialis expressed therefrom and delivered to the piston; all as more fullyhereinafter set forth and as claimed. I

Pumps of the type of which my inven-. tion relates are subject to onedisadvantage which it has been a desideratum in the art to overcome.Usually the piston in the ypes of pump mentioned consists of cuppedleather or other similar material arranged to snugly fit the cylinderwall and arranged to. expand thereagainst on the pressure stroke.Leather and similar materials ordinarily used for such pistons tend tobecome dry, and, particularly after periods of non-use, become hard andlose their flexivices and in complicated parts.

An object of my invention is to overcome the disadvantages mentioned andto produce a simple and inexpensive pump-of the class described and onehaving a minimum number of parts.

In the accompanying drawings showing one form of a specific embodimentof my invention,

Figure 1 is a segmental vertical section,

. cupped piston valve.

showing the handle, cylinder and top, with the piston at the end of thesuction stroke;

Fig. 2 is a similar view showing the piston at the end of itscompressionstroke;

Fig. 3 is atop plan view of the piston taken on line 3- -3 of Fig. 1;and

Fig. 4 is a disassembled perspective of tha piston and the lower end ofthe piston ro In the drawings, element 1 indicates the cylinder and 2the top cylinder head which may be screwed or otherwise attached to thecylinder. The piston rod 3 has a handle 4 attached thereto in theordinary Way and at its lower end is threaded as at 5 and shouldered asat 6 and 7, for the reception and retention of the several partsconstituting the piston. The steel guide washer 8 is advantageouslyprovided with recesses 9 and such washer fits on the lower end of thepiston rod against the shoulder 7. The cupped-leather oiling device 10is prefer ably made of thick felt or other oil-absorbing, compressiblematerial. This is placed in position on the lower end of the piston rodwith its upper face against the lower face of the steel guide washer 8with its recesses 11 registering with the recesses 9 of such guidewasher. This is for the purpose of permitting the air or gas to pass onthe suction stroke. The cupped leather combined piston and valve 12 isseated on the piston rod directl under the oiling device, steel washer13 with peripheral recesses being interposed and abutting against theshoulder 6. This steel washer serves to spread and direct-the oil to theperiphery of the cupped-piston where the oil is most needed. The lengthof the piston rod from shoulder 6.to shoulder 7 is so calculated.inaccordance with the thickness of the cup 12,

washer 13, oiling device 10 and guide washer 8 as to permit fullexpansion of the oiling device 10 without any loose play. Inside thecupped leather plunger a steel washer 1'4.- 100 is placed. This servesthe purpose of retaining the shape of the upper face of the Under thesteel washer 14, leather or fiber lock washer 15 is used and all theparts just mentioned are 105 securely held in position by means of thenut 16 threaded to the extremity 5 of the piston rod and abuttingagainst the shoulder 6.

Surrounding the piston rod is coiled 110 ,spring 17 adapted to becompressed on the device between itself and the cupped piston 12 withthe result that the oil is expressed from the absorbent material andflows over the walls of the piston,'being u'ided to the walls bythe'steel washer 1 k.

Xcess oil is immediately reabsorbed by the absorbing material of thelubricating device when the pressure of the spring 1s released. Beforethe pump is assembled the lubricating device is saturated with oil andsuch device, being of felt or other absorbent material, retains this oilfor a considerable period of time. In actual and ordinary use it hasbeen found unnecessary to renew the lubricant Within eight to twelvemonths. However in event it is desirable to supply oil to the absorbingmaterial, it may readily be done through a hole indicated, at 18 in thetop of the piston head or cap. The lower piston base 19 may be'securedin place in any ordinary .way and may be provided with the usual valve(not shown) and discharge connections for the hose.

What claim is:

1. An air or gas pump comprising a cylinder, a piston, a piston rod andreciprocating means therefor, and lubricating means for the pistonlocated in proximity thereto, such lubricating means comprisingcompressible lubricant absorbing material carrying lubricant, and a coilspring surrounding the piston rod and adapted to be compressed upon thesuction stroke of the piston against the top of the pump and saidabsorbent material to express lubricant therefrom.

3. An'air or gas pump comprising a cylinder, a piston rod and a piston,said piston comprising a cupped piston valve, means for retaining it inplace on said rod, a lubricating device in proximity to the topthereof,-a spring surrounding the said rod and adapted to be compressedbetween the top of the cylinder and said oiling device, whereby at theend of the stroke oil in said device will be expressed therefrom and Howon to the cupped piston-valves.

In testimony whereof, I aflix my signature.

CHARLES S. McINTYRE.

